40gbase-kr4 microprocessor interface – Altera 40-Gbps Ethernet MAC and PHY MegaCore Function User Manual
Page 96
Signal Name
Direction
Description
pcs_mode_rc[5:0]
Output
Specifies the PCS mode for reconfiguration. Has the
following valid values:
• b'000001: auto-negotiation mode
• b'000010: link training mode
• b'100000: data mode (normal operation)
Other values are not valid for the 40GBASE-KR4 IP core.
en_lcl_rxeq[3:0]
Output
When a bit is asserted, it signals that an additional custom
RX equalization is enabled for the corresponding lane. The
bits are identical to the Link Trained status bits 0xD2 [0],
[8], [16], and [24].
rxeq_done[3:0]
Input
When asserted, indicates that custom RX equalization is
complete. The PHY IP core ANDs each bit of this signal
with
rx_trained
from the Training State Diagram for the
corresponding lane.
reco_mif_done
Input
Reset signal the user logic asserts after completing MIF
programming.
Related Information
40-100GbE IP Core Example Design
The 40GBASE-KR4 example design, specifically the reconfiguration bundle and its connections to the IP
core, provide an example of how to coordinate use of the transceiver reconfiguration interface and the
40GBASE-KR4 specific reconfiguration interface to your 40GBASE-KR4 IP core.
40GBASE-KR4 Microprocessor Interface
The optional embedded processor interface signals allow you to use the embedded processor mode of
Link Training. This mode overrides the TX adaptation algorithm and allows an embedded processor to
initialize the link.
Table 3-14: 40GBASE-KR4 Microprocessor Interface Signals
Signals with a width of 4 x n are divided into fields of width n. Bits [n-1:0] refer to Lane 0, bits [2n-1:n] refer to
Lane 1, bits [3n-1:2n] refer to Lane 2, and bits [4n-1:3n] refer to Lane 3. These signals are only available if you turn
on Enable microprocessor interface.
Signal Name
Direction
Description
upi_mode_en[3:0]
Input
When a bit is asserted, enables embedded processor mode
on the corresponding lane.
UG-01088
2014.12.15
40GBASE-KR4 Microprocessor Interface
3-49
Functional Description
Altera Corporation